Pruitt’s comments come after conservative groups petitioned him to reconsider the 2009 endangerment finding that gave EPA the power to issue global warming rules. Pruitt said there was a “breach of process” in issuing the finding.

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At least two groups, the Competitive Enterprise Institute (CEI) and Concerned Household Electricity Consumers Council, have filed petitions with EPA to reconsider the endangerment finding.

CEI sent a letter to Pruitt in October signed by “60 climate and health experts” asking Pruitt to respond to the group’s endangerment finding petition.

“As our petition points out, there are huge problems with the computer models on which the Endangerment Finding was based, which means our government’s climate policy rests on bad science,” Sam Kazman, CEI’s general counsel, said in a statement.